Which widespread product has a feature that might not be widely known?

A common product with a feature that might not be widely known is the microwave oven. Many people use microwave ovens for their basic function: heating and defrosting food. However, a lesser-known feature is the ability to use the microwave for a process called tempering. This process involves melting chocolate or butter without burning it, thanks to the microwave’s precise power level settings. Users can set the power level to 50% or lower, which allows them to gently heat chocolate or butter, stirring occasionally, to achieve a smooth consistency. Moreover, most modern microwaves come with sensor reheat technology, which adjusts the cooking time automatically based on the moisture level in the food, ensuring optimal heating. Despite these advanced features, many users might not fully utilize them due to unfamiliarity, sticking instead to the basic functions of quick heating and defrosting.